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Author

Frederik Verhaeghe

Other affiliations: Umicore
Bio: Frederik Verhaeghe is an academic researcher from Katholieke Universiteit Leuven. The author has contributed to research in topics: Dissolution & Lattice Boltzmann methods. The author has an hindex of 14, co-authored 35 publications receiving 2633 citations. Previous affiliations of Frederik Verhaeghe include Umicore.

Papers
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Journal ArticleDOI
TL;DR: In this article, the development of the microstructure of the Ti-6Al-4V alloy processed by selective laser melting (SLM) was studied by light optical microscopy.

2,201 citations

Journal ArticleDOI
TL;DR: In this article, the authors present a pragmatic engineering model to study aspects of the SLM process using an enthalpy formulation and accounting for shrinkage and laser light penetration, and investigate the importance of evaporation for a set of process parameters relevant to production.

271 citations

Journal ArticleDOI
TL;DR: The lattice Boltzmann equation (LBE) with multiple relaxation times (MRT) is presented to simulate pressure-driven gaseous flow in a long microchannel and results agree very well with IP-DSMC and DSMC results in the slip velocity regime, but deviate significantly in the transition-flow regime.

181 citations

Journal ArticleDOI
TL;DR: In this paper, the dissolution of magnesia particles in synthetic CaO-Al 2 O 3 -SiO 2 (CAS)-based slags with and without MgO addition was investigated in situ with a confocal scanning laser microscope (CSLM) at 1500 and 1600 ǫ c.
Abstract: The dissolution of magnesia particles in synthetic CaO–Al 2 O 3 –SiO 2 (CAS)-based slags with and without MgO addition was investigated in situ with a confocal scanning laser microscope (CSLM) at 1500 and 1600 °C. The dissolution process was recorded. The effects of slag composition and temperature on the dissolution process and the time dependency of the MgO particle size during dissolution were obtained. Increasing the temperature increases the dissolution rate. However, MgO addition to the slag retards the dissolution rate significantly. The rate limiting steps are discussed. It is shown that boundary layer diffusion is responsible for the dissolution. By combining in situ observations with post mortem analyses, thermodynamic calculations of local and global equilibrium, and kinetic considerations, the conditions under which MgAl 2 O 4 spinel can be formed at the particle–slag interface are clarified.

106 citations

Journal ArticleDOI
TL;DR: By combining the boundary conditions with a volume-of-fluid description of solid structures, the application area of the presented model is extended toward complex dissolution phenomena.
Abstract: In this work, we present a lattice-Boltzmann model for the simulation of complex dissolution phenomena. We design boundary conditions to impose a fixed concentration or a surface flux for use in multicomponent lattice-Boltzmann models. These conditions can be applied to simulate complex reactive flow phenomena, e.g., in porous media. By combining the boundary conditions with a volume-of-fluid description of solid structures, the application area of the presented model is extended toward complex dissolution phenomena. The boundary conditions and the dissolution model are validated using benchmark problems with analytical solutions. The agreement is good in all tested cases.

53 citations


Cited by
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Journal ArticleDOI
TL;DR: A review of the emerging research on additive manufacturing of metallic materials is provided in this article, which provides a comprehensive overview of the physical processes and the underlying science of metallurgical structure and properties of the deposited parts.

4,192 citations

Journal ArticleDOI
TL;DR: In this paper, the authors describe the complex relationship between additive manufacturing processes, microstructure and resulting properties for metals, and typical microstructures for additively manufactured steel, aluminium and titanium are presented.

2,837 citations

Journal ArticleDOI
TL;DR: Additive manufacturing implies layer by layer shaping and consolidation of powder feedstock to arbitrary configurations, normally using a computer controlled laser as discussed by the authors, which is based on a novel materials incremental manufacturing philosophy.
Abstract: Unlike conventional materials removal methods, additive manufacturing (AM) is based on a novel materials incremental manufacturing philosophy. Additive manufacturing implies layer by layer shaping and consolidation of powder feedstock to arbitrary configurations, normally using a computer controlled laser. The current development focus of AM is to produce complex shaped functional metallic components, including metals, alloys and metal matrix composites (MMCs), to meet demanding requirements from aerospace, defence, automotive and biomedical industries. Laser sintering (LS), laser melting (LM) and laser metal deposition (LMD) are presently regarded as the three most versatile AM processes. Laser based AM processes generally have a complex non-equilibrium physical and chemical metallurgical nature, which is material and process dependent. The influence of material characteristics and processing conditions on metallurgical mechanisms and resultant microstructural and mechanical properties of AM proc...

2,402 citations

Journal ArticleDOI
TL;DR: In this article, the development of the microstructure of the Ti-6Al-4V alloy processed by selective laser melting (SLM) was studied by light optical microscopy.

2,201 citations

Journal ArticleDOI
TL;DR: In this article, a review of additive manufacturing (AM) techniques for producing metal parts are explored, with a focus on the science of metal AM: processing defects, heat transfer, solidification, solid-state precipitation, mechanical properties and post-processing metallurgy.
Abstract: Additive manufacturing (AM), widely known as 3D printing, is a method of manufacturing that forms parts from powder, wire or sheets in a process that proceeds layer by layer. Many techniques (using many different names) have been developed to accomplish this via melting or solid-state joining. In this review, these techniques for producing metal parts are explored, with a focus on the science of metal AM: processing defects, heat transfer, solidification, solid-state precipitation, mechanical properties and post-processing metallurgy. The various metal AM techniques are compared, with analysis of the strengths and limitations of each. Only a few alloys have been developed for commercial production, but recent efforts are presented as a path for the ongoing development of new materials for AM processes.

1,713 citations